Congratulations, Rosencrantz!
To be fair (and I think I've mentioned this elsewhere), the ToAU jobs, having come out 4 years after launch, assume to a certain degree that you're already established in the game before you level them. PUP attachments are really expensive, BLU assumes you've got high level friends to help with your spells, and COR assumes you are either filthy rich or have leveled one of the four jobs with Crossbow access so you can get Marksmanship up without spending several million gil on bullets. You see it a bit to a lesser degree with some Zilart jobs, like NIN and SMN. As it stands, nobody really expects COR to do damage; once your skill's capped, you really only bust out the gun for Quick Draw and Light/Dark Shot.
Not saying this is good design (and was since rescinded, as DNC and SCH are easy job quests with very little overhead), but there you go.